Ar-15 ??
 

I just picked up an old Colt AR-15 from one of my friends,when we took it to the range it seems like the springs are worn out from sitting 22 yrs without being shot? I shot the first ten rounds then it didnt cycle the next round.then fierd 5 more the the same thing ? When you chamber a round it sticks like the spring has no life in it ? could this be the issue or is it something else .Thanks !!!!

..............and then lube it !